[2ff2076] | 1 | /***************************************************************************\ |
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| 2 | * * |
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| 3 | * BitlBee - An IRC to IM gateway * |
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| 4 | * Jabber module - SOCKS5 Bytestreams ( XEP-0065 ) * |
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| 5 | * * |
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| 6 | * Copyright 2007 Uli Meis <a.sporto+bee@gmail.com> * |
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| 7 | * * |
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| 8 | * This program is free software; you can redistribute it and/or modify * |
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| 9 | * it under the terms of the GNU General Public License as published by * |
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| 10 | * the Free Software Foundation; either version 2 of the License, or * |
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| 11 | * (at your option) any later version. * |
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| 12 | * * |
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| 13 | * This program is distributed in the hope that it will be useful, * |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 16 | * GNU General Public License for more details. * |
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| 17 | * * |
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| 18 | * You should have received a copy of the GNU General Public License along * |
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| 19 | * with this program; if not, write to the Free Software Foundation, Inc., * |
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| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * |
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| 21 | * * |
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| 22 | \***************************************************************************/ |
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| 23 | |
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| 24 | #include "jabber.h" |
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| 25 | #include "sha1.h" |
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| 26 | #include <poll.h> |
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| 27 | |
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| 28 | struct bs_transfer { |
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| 29 | |
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| 30 | struct jabber_transfer *tf; |
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| 31 | |
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[dc0ba9c] | 32 | jabber_streamhost_t *sh; |
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| 33 | GSList *streamhosts; |
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[2ff2076] | 34 | |
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| 35 | enum |
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| 36 | { |
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| 37 | BS_PHASE_CONNECT, |
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| 38 | BS_PHASE_CONNECTED, |
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| 39 | BS_PHASE_REQUEST, |
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| 40 | BS_PHASE_REPLY |
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| 41 | } phase; |
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| 42 | |
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| 43 | /* SHA1( SID + Initiator JID + Target JID) */ |
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| 44 | char *pseudoadr; |
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| 45 | |
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| 46 | gint connect_timeout; |
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| 47 | }; |
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| 48 | |
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| 49 | struct socks5_message |
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| 50 | { |
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| 51 | unsigned char ver; |
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| 52 | union |
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| 53 | { |
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| 54 | unsigned char cmd; |
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| 55 | unsigned char rep; |
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| 56 | } cmdrep; |
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| 57 | unsigned char rsv; |
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| 58 | unsigned char atyp; |
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| 59 | unsigned char addrlen; |
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| 60 | unsigned char address[40]; |
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| 61 | in_port_t port; |
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| 62 | } __attribute__ ((packed)); |
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| 63 | |
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| 64 | /* connect() timeout in seconds. */ |
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| 65 | #define JABBER_BS_CONTIMEOUT 15 |
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| 66 | /* listen timeout */ |
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| 67 | #define JABBER_BS_LISTEN_TIMEOUT 90 |
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| 68 | |
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| 69 | /* very useful */ |
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| 70 | #define ASSERTSOCKOP(op, msg) \ |
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| 71 | if( (op) == -1 ) \ |
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| 72 | return jabber_bs_abort( bt , msg ": %s", strerror( errno ) ); |
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| 73 | |
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| 74 | gboolean jabber_bs_abort( struct bs_transfer *bt, char *format, ... ); |
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| 75 | void jabber_bs_canceled( file_transfer_t *ft , char *reason ); |
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[dc0ba9c] | 76 | void jabber_bs_free_transfer( file_transfer_t *ft ); |
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[2ff2076] | 77 | gboolean jabber_bs_connect_timeout( gpointer data, gint fd, b_input_condition cond ); |
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| 78 | gboolean jabber_bs_poll( struct bs_transfer *bt, int fd, short *revents ); |
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| 79 | gboolean jabber_bs_peek( struct bs_transfer *bt, void *buffer, int buflen ); |
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| 80 | |
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| 81 | void jabber_bs_recv_answer_request( struct bs_transfer *bt ); |
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| 82 | gboolean jabber_bs_recv_read( gpointer data, gint fd, b_input_condition cond ); |
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[dce3903] | 83 | gboolean jabber_bs_recv_write_request( file_transfer_t *ft ); |
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[2ff2076] | 84 | gboolean jabber_bs_recv_handshake( gpointer data, gint fd, b_input_condition cond ); |
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| 85 | gboolean jabber_bs_recv_handshake_abort( struct bs_transfer *bt, char *error ); |
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[dc0ba9c] | 86 | int jabber_bs_recv_request( struct im_connection *ic, struct xt_node *node, struct xt_node *qnode ); |
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[2ff2076] | 87 | |
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| 88 | gboolean jabber_bs_send_handshake_abort( struct bs_transfer *bt, char *error ); |
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[dc0ba9c] | 89 | gboolean jabber_bs_send_request( struct jabber_transfer *tf, GSList *streamhosts ); |
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[2ff2076] | 90 | gboolean jabber_bs_send_handshake( gpointer data, gint fd, b_input_condition cond ); |
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| 91 | gboolean jabber_bs_send_listen( struct bs_transfer *bt, struct sockaddr_storage *saddr, char *host, char *port ); |
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[dc0ba9c] | 92 | static xt_status jabber_bs_send_handle_activate( struct im_connection *ic, struct xt_node *node, struct xt_node *orig ); |
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| 93 | void jabber_bs_send_activate( struct bs_transfer *bt ); |
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[2ff2076] | 94 | |
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| 95 | /* |
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| 96 | * Frees a bs_transfer struct and calls the SI free function |
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| 97 | */ |
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| 98 | void jabber_bs_free_transfer( file_transfer_t *ft) { |
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| 99 | struct jabber_transfer *tf = ft->data; |
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| 100 | struct bs_transfer *bt = tf->streamhandle; |
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[dc0ba9c] | 101 | jabber_streamhost_t *sh; |
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[2ff2076] | 102 | |
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[2625d6d] | 103 | if ( bt->connect_timeout ) |
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| 104 | { |
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| 105 | b_event_remove( bt->connect_timeout ); |
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| 106 | bt->connect_timeout = 0; |
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| 107 | } |
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| 108 | |
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[2ff2076] | 109 | if ( tf->watch_in ) |
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| 110 | b_event_remove( tf->watch_in ); |
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| 111 | |
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| 112 | if( tf->watch_out ) |
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| 113 | b_event_remove( tf->watch_out ); |
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| 114 | |
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| 115 | g_free( bt->pseudoadr ); |
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[dc0ba9c] | 116 | |
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| 117 | while( bt->streamhosts ) |
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| 118 | { |
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| 119 | sh = bt->streamhosts->data; |
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| 120 | bt->streamhosts = g_slist_remove( bt->streamhosts, sh ); |
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| 121 | g_free( sh->jid ); |
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| 122 | g_free( sh->host ); |
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| 123 | g_free( sh ); |
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| 124 | } |
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| 125 | |
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[2ff2076] | 126 | g_free( bt ); |
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[dce3903] | 127 | |
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[2ff2076] | 128 | jabber_si_free_transfer( ft ); |
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| 129 | } |
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| 130 | |
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[dc0ba9c] | 131 | /* |
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| 132 | * Checks if buflen data is available on the socket and |
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| 133 | * writes it to buffer if that's the case. |
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| 134 | */ |
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[2ff2076] | 135 | gboolean jabber_bs_peek( struct bs_transfer *bt, void *buffer, int buflen ) |
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| 136 | { |
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| 137 | int ret; |
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| 138 | int fd = bt->tf->fd; |
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| 139 | |
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| 140 | ASSERTSOCKOP( ret = recv( fd, buffer, buflen, MSG_PEEK ), "MSG_PEEK'ing" ); |
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| 141 | |
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| 142 | if( ret == 0 ) |
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| 143 | return jabber_bs_abort( bt, "Remote end closed connection" ); |
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| 144 | |
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| 145 | if( ret < buflen ) |
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| 146 | return ret; |
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| 147 | |
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| 148 | ASSERTSOCKOP( ret = recv( fd, buffer, buflen, 0 ), "Dequeuing after MSG_PEEK" ); |
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| 149 | |
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| 150 | if( ret != buflen ) |
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| 151 | return jabber_bs_abort( bt, "recv returned less than previous recv with MSG_PEEK" ); |
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| 152 | |
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| 153 | return ret; |
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| 154 | } |
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| 155 | |
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| 156 | |
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| 157 | /* |
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| 158 | * This function is scheduled in bs_handshake via b_timeout_add after a (non-blocking) connect(). |
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| 159 | */ |
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| 160 | gboolean jabber_bs_connect_timeout( gpointer data, gint fd, b_input_condition cond ) |
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| 161 | { |
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| 162 | struct bs_transfer *bt = data; |
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| 163 | |
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| 164 | bt->connect_timeout = 0; |
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| 165 | |
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| 166 | jabber_bs_abort( bt, "no connection after %d seconds", bt->tf->ft->sending ? JABBER_BS_LISTEN_TIMEOUT : JABBER_BS_CONTIMEOUT ); |
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| 167 | |
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| 168 | return FALSE; |
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| 169 | } |
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| 170 | |
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[dc0ba9c] | 171 | /* |
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| 172 | * Polls the socket, checks for errors and removes a connect timer |
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| 173 | * if there is one. |
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| 174 | */ |
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[2ff2076] | 175 | gboolean jabber_bs_poll( struct bs_transfer *bt, int fd, short *revents ) |
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| 176 | { |
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| 177 | struct pollfd pfd = { .fd = fd, .events = POLLHUP|POLLERR }; |
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| 178 | |
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| 179 | if ( bt->connect_timeout ) |
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| 180 | { |
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| 181 | b_event_remove( bt->connect_timeout ); |
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| 182 | bt->connect_timeout = 0; |
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| 183 | } |
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| 184 | |
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| 185 | ASSERTSOCKOP( poll( &pfd, 1, 0 ), "poll()" ) |
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| 186 | |
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| 187 | if( pfd.revents & POLLERR ) |
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| 188 | { |
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| 189 | int sockerror; |
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| 190 | socklen_t errlen = sizeof( sockerror ); |
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| 191 | |
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| 192 | if ( getsockopt( fd, SOL_SOCKET, SO_ERROR, &sockerror, &errlen ) ) |
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| 193 | return jabber_bs_abort( bt, "getsockopt() failed, unknown socket error during SOCKS5 handshake (weird!)" ); |
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| 194 | |
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| 195 | if ( bt->phase == BS_PHASE_CONNECTED ) |
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| 196 | return jabber_bs_abort( bt, "connect failed: %s", strerror( sockerror ) ); |
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| 197 | |
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| 198 | return jabber_bs_abort( bt, "Socket error during SOCKS5 handshake(weird!): %s", strerror( sockerror ) ); |
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| 199 | } |
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| 200 | |
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| 201 | if( pfd.revents & POLLHUP ) |
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| 202 | return jabber_bs_abort( bt, "Remote end closed connection" ); |
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| 203 | |
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| 204 | *revents = pfd.revents; |
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| 205 | |
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| 206 | return TRUE; |
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| 207 | } |
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| 208 | |
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[dc0ba9c] | 209 | /* |
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| 210 | * Used for receive and send path. |
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| 211 | */ |
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[2ff2076] | 212 | gboolean jabber_bs_abort( struct bs_transfer *bt, char *format, ... ) |
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| 213 | { |
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| 214 | va_list params; |
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| 215 | va_start( params, format ); |
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| 216 | char error[128]; |
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| 217 | |
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| 218 | if( vsnprintf( error, 128, format, params ) < 0 ) |
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| 219 | sprintf( error, "internal error parsing error string (BUG)" ); |
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| 220 | va_end( params ); |
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| 221 | if( bt->tf->ft->sending ) |
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| 222 | return jabber_bs_send_handshake_abort( bt, error ); |
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[dc0ba9c] | 223 | else |
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| 224 | return jabber_bs_recv_handshake_abort( bt, error ); |
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[2ff2076] | 225 | } |
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| 226 | |
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| 227 | /* Bad luck */ |
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| 228 | void jabber_bs_canceled( file_transfer_t *ft , char *reason ) |
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| 229 | { |
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| 230 | struct jabber_transfer *tf = ft->data; |
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| 231 | |
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| 232 | imcb_log( tf->ic, "File transfer aborted: %s", reason ); |
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| 233 | } |
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| 234 | |
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| 235 | /* |
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| 236 | * Parses an incoming bytestream request and calls jabber_bs_handshake on success. |
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| 237 | */ |
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| 238 | int jabber_bs_recv_request( struct im_connection *ic, struct xt_node *node, struct xt_node *qnode) |
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| 239 | { |
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| 240 | char *sid, *ini_jid, *tgt_jid, *mode, *iq_id; |
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| 241 | struct jabber_data *jd = ic->proto_data; |
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| 242 | struct jabber_transfer *tf = NULL; |
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| 243 | GSList *tflist; |
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| 244 | struct bs_transfer *bt; |
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[dc0ba9c] | 245 | GSList *shlist=NULL; |
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| 246 | struct xt_node *shnode; |
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[2ff2076] | 247 | |
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| 248 | sha1_state_t sha; |
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| 249 | char hash_hex[41]; |
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| 250 | unsigned char hash[20]; |
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| 251 | int i; |
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| 252 | |
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| 253 | if( !(iq_id = xt_find_attr( node, "id" ) ) || |
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| 254 | !(ini_jid = xt_find_attr( node, "from" ) ) || |
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| 255 | !(tgt_jid = xt_find_attr( node, "to" ) ) || |
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| 256 | !(sid = xt_find_attr( qnode, "sid" ) ) ) |
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| 257 | { |
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| 258 | imcb_log( ic, "WARNING: Received incomplete SI bytestream request"); |
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| 259 | return XT_HANDLED; |
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| 260 | } |
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| 261 | |
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| 262 | if( ( mode = xt_find_attr( qnode, "mode" ) ) && |
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| 263 | ( strcmp( mode, "tcp" ) != 0 ) ) |
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| 264 | { |
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| 265 | imcb_log( ic, "WARNING: Received SI Request for unsupported bytestream mode %s", xt_find_attr( qnode, "mode" ) ); |
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| 266 | return XT_HANDLED; |
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| 267 | } |
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| 268 | |
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[dc0ba9c] | 269 | shnode = qnode->children; |
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| 270 | while( ( shnode = xt_find_node( shnode, "streamhost" ) ) ) |
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| 271 | { |
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| 272 | char *jid, *host; |
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| 273 | int port; |
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| 274 | if( ( jid = xt_find_attr( shnode, "jid" ) ) && |
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| 275 | ( host = xt_find_attr( shnode, "host" ) ) && |
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| 276 | ( ( port = atoi( xt_find_attr( shnode, "port" ) ) ) ) ) |
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| 277 | { |
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| 278 | jabber_streamhost_t *sh = g_new0( jabber_streamhost_t, 1 ); |
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| 279 | sh->jid = g_strdup(jid); |
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| 280 | sh->host = g_strdup(host); |
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| 281 | sprintf( sh->port, "%u", port ); |
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| 282 | shlist = g_slist_append( shlist, sh ); |
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| 283 | } |
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| 284 | shnode = shnode->next; |
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| 285 | } |
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| 286 | |
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| 287 | if( !shlist ) |
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| 288 | { |
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| 289 | imcb_log( ic, "WARNING: Received incomplete SI bytestream request, no parseable streamhost entries"); |
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| 290 | return XT_HANDLED; |
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| 291 | } |
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| 292 | |
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[2ff2076] | 293 | /* Let's see if we can find out what this bytestream should be for... */ |
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| 294 | |
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| 295 | for( tflist = jd->filetransfers ; tflist; tflist = g_slist_next(tflist) ) |
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| 296 | { |
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| 297 | struct jabber_transfer *tft = tflist->data; |
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| 298 | if( ( strcmp( tft->sid, sid ) == 0 ) && |
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| 299 | ( strcmp( tft->ini_jid, ini_jid ) == 0 ) && |
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| 300 | ( strcmp( tft->tgt_jid, tgt_jid ) == 0 ) ) |
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| 301 | { |
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| 302 | tf = tft; |
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| 303 | break; |
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| 304 | } |
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| 305 | } |
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| 306 | |
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| 307 | if (!tf) |
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| 308 | { |
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| 309 | imcb_log( ic, "WARNING: Received bytestream request from %s that doesn't match an SI request", ini_jid ); |
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| 310 | return XT_HANDLED; |
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| 311 | } |
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| 312 | |
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| 313 | /* iq_id and canceled can be reused since SI is done */ |
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| 314 | g_free( tf->iq_id ); |
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| 315 | tf->iq_id = g_strdup( iq_id ); |
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| 316 | |
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| 317 | tf->ft->canceled = jabber_bs_canceled; |
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| 318 | |
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| 319 | /* SHA1( SID + Initiator JID + Target JID ) is given to the streamhost which it will match against the initiator's value */ |
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| 320 | sha1_init( &sha ); |
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| 321 | sha1_append( &sha, (unsigned char*) sid, strlen( sid ) ); |
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| 322 | sha1_append( &sha, (unsigned char*) ini_jid, strlen( ini_jid ) ); |
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| 323 | sha1_append( &sha, (unsigned char*) tgt_jid, strlen( tgt_jid ) ); |
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| 324 | sha1_finish( &sha, hash ); |
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| 325 | |
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| 326 | for( i = 0; i < 20; i ++ ) |
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| 327 | sprintf( hash_hex + i * 2, "%02x", hash[i] ); |
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| 328 | |
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| 329 | bt = g_new0( struct bs_transfer, 1 ); |
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| 330 | bt->tf = tf; |
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[dc0ba9c] | 331 | bt->streamhosts = shlist; |
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| 332 | bt->sh = shlist->data; |
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[2ff2076] | 333 | bt->phase = BS_PHASE_CONNECT; |
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| 334 | bt->pseudoadr = g_strdup( hash_hex ); |
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| 335 | tf->streamhandle = bt; |
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| 336 | tf->ft->free = jabber_bs_free_transfer; |
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| 337 | |
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| 338 | jabber_bs_recv_handshake( bt, 0, 0 ); |
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| 339 | |
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| 340 | return XT_HANDLED; |
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| 341 | } |
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[dc0ba9c] | 342 | |
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[2ff2076] | 343 | /* |
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| 344 | * This is what a protocol handshake can look like in cooperative multitasking :) |
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| 345 | * Might be confusing at first because it's called from different places and is recursing. |
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| 346 | * (places being the event thread, bs_request, bs_handshake_abort, and itself) |
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| 347 | * |
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| 348 | * All in all, it turned out quite nice :) |
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| 349 | */ |
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| 350 | gboolean jabber_bs_recv_handshake( gpointer data, gint fd, b_input_condition cond ) |
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| 351 | { |
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| 352 | |
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| 353 | struct bs_transfer *bt = data; |
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| 354 | short revents; |
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[6cac643] | 355 | int gret; |
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[2ff2076] | 356 | |
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[2625d6d] | 357 | if ( ( fd != 0 ) && !jabber_bs_poll( bt, fd, &revents ) ) |
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[2ff2076] | 358 | return FALSE; |
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| 359 | |
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| 360 | switch( bt->phase ) |
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| 361 | { |
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| 362 | case BS_PHASE_CONNECT: |
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| 363 | { |
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| 364 | struct addrinfo hints, *rp; |
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| 365 | |
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[dc0ba9c] | 366 | memset( &hints, 0, sizeof( struct addrinfo ) ); |
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| 367 | hints.ai_socktype = SOCK_STREAM; |
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[2ff2076] | 368 | |
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[6cac643] | 369 | if ( ( gret = getaddrinfo( bt->sh->host, bt->sh->port, &hints, &rp ) ) != 0 ) |
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| 370 | return jabber_bs_abort( bt, "getaddrinfo() failed: %s", gai_strerror( gret ) ); |
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[2ff2076] | 371 | |
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[dc0ba9c] | 372 | ASSERTSOCKOP( bt->tf->fd = fd = socket( rp->ai_family, rp->ai_socktype, 0 ), "Opening socket" ); |
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[2ff2076] | 373 | |
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[dc0ba9c] | 374 | sock_make_nonblocking( fd ); |
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[2ff2076] | 375 | |
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[dc0ba9c] | 376 | imcb_log( bt->tf->ic, "File %s: Connecting to streamhost %s:%s", bt->tf->ft->file_name, bt->sh->host, bt->sh->port ); |
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[2ff2076] | 377 | |
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[dc0ba9c] | 378 | if( ( connect( fd, rp->ai_addr, rp->ai_addrlen ) == -1 ) && |
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| 379 | ( errno != EINPROGRESS ) ) |
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| 380 | return jabber_bs_abort( bt , "connect() failed: %s", strerror( errno ) ); |
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[2ff2076] | 381 | |
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[dc0ba9c] | 382 | freeaddrinfo( rp ); |
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[2ff2076] | 383 | |
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[dc0ba9c] | 384 | bt->phase = BS_PHASE_CONNECTED; |
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| 385 | |
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| 386 | bt->tf->watch_out = b_input_add( fd, GAIM_INPUT_WRITE, jabber_bs_recv_handshake, bt ); |
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[2ff2076] | 387 | |
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[dc0ba9c] | 388 | /* since it takes forever(3mins?) till connect() fails on itself we schedule a timeout */ |
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| 389 | bt->connect_timeout = b_timeout_add( JABBER_BS_CONTIMEOUT * 1000, jabber_bs_connect_timeout, bt ); |
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[2ff2076] | 390 | |
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[dc0ba9c] | 391 | bt->tf->watch_in = 0; |
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| 392 | return FALSE; |
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[2ff2076] | 393 | } |
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| 394 | case BS_PHASE_CONNECTED: |
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| 395 | { |
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| 396 | struct { |
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| 397 | unsigned char ver; |
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| 398 | unsigned char nmethods; |
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| 399 | unsigned char method; |
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| 400 | } socks5_hello = { |
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| 401 | .ver = 5, |
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| 402 | .nmethods = 1, |
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| 403 | .method = 0x00 /* no auth */ |
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| 404 | /* one could also implement username/password. If you know |
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| 405 | * a jabber client or proxy that actually does it, tell me. |
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| 406 | */ |
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| 407 | }; |
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| 408 | |
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| 409 | ASSERTSOCKOP( send( fd, &socks5_hello, sizeof( socks5_hello ) , 0 ), "Sending auth request" ); |
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| 410 | |
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| 411 | bt->phase = BS_PHASE_REQUEST; |
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| 412 | |
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| 413 | bt->tf->watch_in = b_input_add( fd, GAIM_INPUT_READ, jabber_bs_recv_handshake, bt ); |
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| 414 | |
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| 415 | bt->tf->watch_out = 0; |
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| 416 | return FALSE; |
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| 417 | } |
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| 418 | case BS_PHASE_REQUEST: |
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| 419 | { |
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| 420 | struct socks5_message socks5_connect = |
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| 421 | { |
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| 422 | .ver = 5, |
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| 423 | .cmdrep.cmd = 0x01, |
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| 424 | .rsv = 0, |
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| 425 | .atyp = 0x03, |
---|
| 426 | .addrlen = strlen( bt->pseudoadr ), |
---|
| 427 | .port = 0 |
---|
| 428 | }; |
---|
| 429 | int ret; |
---|
| 430 | char buf[2]; |
---|
| 431 | |
---|
| 432 | /* If someone's trying to be funny and sends only one byte at a time we'll fail :) */ |
---|
| 433 | ASSERTSOCKOP( ret = recv( fd, buf, 2, 0 ) , "Receiving auth reply" ); |
---|
| 434 | |
---|
| 435 | if( !( ret == 2 ) || |
---|
| 436 | !( buf[0] == 5 ) || |
---|
| 437 | !( buf[1] == 0 ) ) |
---|
| 438 | return jabber_bs_abort( bt, "Auth not accepted by streamhost (reply: len=%d, ver=%d, status=%d)", |
---|
| 439 | ret, buf[0], buf[1] ); |
---|
| 440 | |
---|
| 441 | /* copy hash into connect message */ |
---|
| 442 | memcpy( socks5_connect.address, bt->pseudoadr, socks5_connect.addrlen ); |
---|
| 443 | |
---|
| 444 | ASSERTSOCKOP( send( fd, &socks5_connect, sizeof( struct socks5_message ), 0 ) , "Sending SOCKS5 Connect" ); |
---|
| 445 | |
---|
| 446 | bt->phase = BS_PHASE_REPLY; |
---|
| 447 | |
---|
| 448 | return TRUE; |
---|
| 449 | } |
---|
| 450 | case BS_PHASE_REPLY: |
---|
| 451 | { |
---|
| 452 | struct socks5_message socks5_reply; |
---|
| 453 | int ret; |
---|
| 454 | |
---|
| 455 | if ( !( ret = jabber_bs_peek( bt, &socks5_reply, sizeof( struct socks5_message ) ) ) ) |
---|
| 456 | return FALSE; |
---|
| 457 | |
---|
| 458 | if ( ret < sizeof( socks5_reply ) ) |
---|
| 459 | return TRUE; |
---|
| 460 | |
---|
| 461 | if( !( socks5_reply.ver == 5 ) || |
---|
| 462 | !( socks5_reply.cmdrep.rep == 0 ) || |
---|
| 463 | !( socks5_reply.atyp == 3 ) || |
---|
| 464 | !( socks5_reply.addrlen == 40 ) ) |
---|
| 465 | return jabber_bs_abort( bt, "SOCKS5 CONNECT failed (reply: ver=%d, rep=%d, atyp=%d, addrlen=%d", |
---|
| 466 | socks5_reply.ver, |
---|
| 467 | socks5_reply.cmdrep.rep, |
---|
| 468 | socks5_reply.atyp, |
---|
| 469 | socks5_reply.addrlen); |
---|
| 470 | |
---|
[dc0ba9c] | 471 | if( bt->tf->ft->sending ) |
---|
| 472 | jabber_bs_send_activate( bt ); |
---|
| 473 | else |
---|
| 474 | jabber_bs_recv_answer_request( bt ); |
---|
[2ff2076] | 475 | |
---|
| 476 | return FALSE; |
---|
| 477 | } |
---|
| 478 | default: |
---|
| 479 | /* BUG */ |
---|
| 480 | imcb_log( bt->tf->ic, "BUG in file transfer code: undefined handshake phase" ); |
---|
| 481 | |
---|
| 482 | bt->tf->watch_in = 0; |
---|
| 483 | return FALSE; |
---|
| 484 | } |
---|
| 485 | } |
---|
| 486 | |
---|
| 487 | /* |
---|
| 488 | * If the handshake failed we can try the next streamhost, if there is one. |
---|
| 489 | * An intelligent sender would probably specify himself as the first streamhost and |
---|
[dce3903] | 490 | * a proxy as the second (Kopete and PSI are examples here). That way, a (potentially) |
---|
| 491 | * slow proxy is only used if neccessary. This of course also means, that the timeout |
---|
| 492 | * per streamhost should be kept short. If one or two firewalled adresses are specified, |
---|
| 493 | * they have to timeout first before a proxy is tried. |
---|
[2ff2076] | 494 | */ |
---|
| 495 | gboolean jabber_bs_recv_handshake_abort( struct bs_transfer *bt, char *error ) |
---|
| 496 | { |
---|
| 497 | struct jabber_transfer *tf = bt->tf; |
---|
| 498 | struct xt_node *reply, *iqnode; |
---|
[dc0ba9c] | 499 | GSList *shlist; |
---|
| 500 | |
---|
| 501 | imcb_log( tf->ic, "Transferring file %s: connection to streamhost %s:%s failed (%s)", |
---|
| 502 | tf->ft->file_name, |
---|
| 503 | bt->sh->host, |
---|
| 504 | bt->sh->port, |
---|
| 505 | error ); |
---|
[2ff2076] | 506 | |
---|
[dc0ba9c] | 507 | /* Alright, this streamhost failed, let's try the next... */ |
---|
| 508 | bt->phase = BS_PHASE_CONNECT; |
---|
| 509 | shlist = g_slist_find( bt->streamhosts, bt->sh ); |
---|
| 510 | if( shlist && shlist->next ) |
---|
[2ff2076] | 511 | { |
---|
[dc0ba9c] | 512 | bt->sh = shlist->next->data; |
---|
| 513 | return jabber_bs_recv_handshake( bt, 0, 0 ); |
---|
[2ff2076] | 514 | } |
---|
| 515 | |
---|
[dc0ba9c] | 516 | |
---|
[2ff2076] | 517 | /* out of stream hosts */ |
---|
| 518 | |
---|
| 519 | iqnode = jabber_make_packet( "iq", "result", tf->ini_jid, NULL ); |
---|
| 520 | reply = jabber_make_error_packet( iqnode, "item-not-found", "cancel" , "404" ); |
---|
| 521 | xt_free_node( iqnode ); |
---|
| 522 | |
---|
| 523 | xt_add_attr( reply, "id", tf->iq_id ); |
---|
| 524 | |
---|
| 525 | if( !jabber_write_packet( tf->ic, reply ) ) |
---|
| 526 | imcb_log( tf->ic, "WARNING: Error transmitting bytestream response" ); |
---|
| 527 | xt_free_node( reply ); |
---|
| 528 | |
---|
| 529 | imcb_file_canceled( tf->ft, "couldn't connect to any streamhosts" ); |
---|
| 530 | |
---|
| 531 | bt->tf->watch_in = 0; |
---|
| 532 | return FALSE; |
---|
| 533 | } |
---|
| 534 | |
---|
| 535 | /* |
---|
| 536 | * After the SOCKS5 handshake succeeds we need to inform the initiator which streamhost we chose. |
---|
| 537 | * If he is the streamhost himself, he might already know that. However, if it's a proxy, |
---|
| 538 | * the initiator will have to make a connection himself. |
---|
| 539 | */ |
---|
| 540 | void jabber_bs_recv_answer_request( struct bs_transfer *bt ) |
---|
| 541 | { |
---|
| 542 | struct jabber_transfer *tf = bt->tf; |
---|
| 543 | struct xt_node *reply; |
---|
| 544 | |
---|
[dce3903] | 545 | imcb_log( tf->ic, "File %s: established SOCKS5 connection to %s:%s", |
---|
[2ff2076] | 546 | tf->ft->file_name, |
---|
[dc0ba9c] | 547 | bt->sh->host, |
---|
| 548 | bt->sh->port ); |
---|
[2ff2076] | 549 | |
---|
| 550 | tf->ft->data = tf; |
---|
[dce3903] | 551 | tf->watch_in = b_input_add( tf->fd, GAIM_INPUT_READ, jabber_bs_recv_read, bt ); |
---|
| 552 | tf->ft->write_request = jabber_bs_recv_write_request; |
---|
[2ff2076] | 553 | |
---|
| 554 | reply = xt_new_node( "streamhost-used", NULL, NULL ); |
---|
[dc0ba9c] | 555 | xt_add_attr( reply, "jid", bt->sh->jid ); |
---|
[2ff2076] | 556 | |
---|
| 557 | reply = xt_new_node( "query", NULL, reply ); |
---|
| 558 | xt_add_attr( reply, "xmlns", XMLNS_BYTESTREAMS ); |
---|
| 559 | |
---|
| 560 | reply = jabber_make_packet( "iq", "result", tf->ini_jid, reply ); |
---|
| 561 | |
---|
| 562 | xt_add_attr( reply, "id", tf->iq_id ); |
---|
| 563 | |
---|
| 564 | if( !jabber_write_packet( tf->ic, reply ) ) |
---|
| 565 | imcb_file_canceled( tf->ft, "Error transmitting bytestream response" ); |
---|
| 566 | xt_free_node( reply ); |
---|
| 567 | } |
---|
| 568 | |
---|
[dce3903] | 569 | /* |
---|
| 570 | * This function is called from write_request directly. If no data is available, it will install itself |
---|
| 571 | * as a watcher for input on fd and once that happens, deliver the data and unschedule itself again. |
---|
| 572 | */ |
---|
[2ff2076] | 573 | gboolean jabber_bs_recv_read( gpointer data, gint fd, b_input_condition cond ) |
---|
| 574 | { |
---|
| 575 | int ret; |
---|
[dce3903] | 576 | struct bs_transfer *bt = data; |
---|
| 577 | struct jabber_transfer *tf = bt->tf; |
---|
[2ff2076] | 578 | |
---|
[dce3903] | 579 | if( fd != 0 ) /* called via event thread */ |
---|
| 580 | { |
---|
| 581 | tf->watch_in = 0; |
---|
| 582 | ASSERTSOCKOP( ret = recv( fd, tf->ft->buffer, sizeof( tf->ft->buffer ), 0 ) , "Receiving" ); |
---|
| 583 | } |
---|
| 584 | else |
---|
[2ff2076] | 585 | { |
---|
[dce3903] | 586 | /* called directly. There might not be any data available. */ |
---|
| 587 | if( ( ( ret = recv( tf->fd, tf->ft->buffer, sizeof( tf->ft->buffer ), 0 ) ) == -1 ) && |
---|
| 588 | ( errno != EAGAIN ) ) |
---|
| 589 | return jabber_bs_abort( bt, "Receiving: %s", strerror( errno ) ); |
---|
| 590 | |
---|
| 591 | if( ( ret == -1 ) && ( errno == EAGAIN ) ) |
---|
[2ff2076] | 592 | { |
---|
[dce3903] | 593 | tf->watch_in = b_input_add( tf->fd, GAIM_INPUT_READ, jabber_bs_recv_read, bt ); |
---|
[2ff2076] | 594 | return FALSE; |
---|
| 595 | } |
---|
| 596 | } |
---|
| 597 | |
---|
[dce3903] | 598 | /* shouldn't happen since we know the file size */ |
---|
[2ff2076] | 599 | if( ret == 0 ) |
---|
[dce3903] | 600 | return jabber_bs_abort( bt, "Remote end closed connection" ); |
---|
[2ff2076] | 601 | |
---|
[dc0ba9c] | 602 | if( tf->bytesread == 0 ) |
---|
| 603 | tf->ft->started = time( NULL ); |
---|
| 604 | |
---|
[2ff2076] | 605 | tf->bytesread += ret; |
---|
| 606 | |
---|
[dce3903] | 607 | tf->ft->write( tf->ft, tf->ft->buffer, ret ); |
---|
[2ff2076] | 608 | |
---|
[dce3903] | 609 | return FALSE; |
---|
[2ff2076] | 610 | } |
---|
| 611 | |
---|
[dce3903] | 612 | /* |
---|
| 613 | * imc callback that is invoked when it is ready to receive some data. |
---|
| 614 | */ |
---|
| 615 | gboolean jabber_bs_recv_write_request( file_transfer_t *ft ) |
---|
[2ff2076] | 616 | { |
---|
| 617 | struct jabber_transfer *tf = ft->data; |
---|
| 618 | |
---|
[dce3903] | 619 | if( tf->watch_in ) |
---|
| 620 | { |
---|
| 621 | imcb_file_canceled( ft, "BUG in jabber file transfer: write_request called when already watching for input" ); |
---|
| 622 | return FALSE; |
---|
| 623 | } |
---|
| 624 | |
---|
| 625 | jabber_bs_recv_read( tf->streamhandle, 0 , 0 ); |
---|
[2ff2076] | 626 | |
---|
[dce3903] | 627 | return TRUE; |
---|
[2ff2076] | 628 | } |
---|
| 629 | |
---|
[dce3903] | 630 | /* |
---|
| 631 | * Issues a write_request to imc. |
---|
| 632 | * */ |
---|
[2ff2076] | 633 | gboolean jabber_bs_send_can_write( gpointer data, gint fd, b_input_condition cond ) |
---|
| 634 | { |
---|
| 635 | struct bs_transfer *bt = data; |
---|
| 636 | |
---|
| 637 | bt->tf->watch_out = 0; |
---|
[dce3903] | 638 | |
---|
| 639 | bt->tf->ft->write_request( bt->tf->ft ); |
---|
| 640 | |
---|
[2ff2076] | 641 | return FALSE; |
---|
| 642 | } |
---|
| 643 | |
---|
[dce3903] | 644 | /* |
---|
| 645 | * This should only be called if we can write, so just do it. |
---|
| 646 | * Add a write watch so we can write more during the next cycle (if possible). |
---|
| 647 | */ |
---|
| 648 | gboolean jabber_bs_send_write( file_transfer_t *ft, char *buffer, unsigned int len ) |
---|
[2ff2076] | 649 | { |
---|
| 650 | struct jabber_transfer *tf = ft->data; |
---|
| 651 | struct bs_transfer *bt = tf->streamhandle; |
---|
| 652 | int ret; |
---|
| 653 | |
---|
[dce3903] | 654 | if( tf->watch_out ) |
---|
| 655 | return jabber_bs_abort( bt, "BUG: write() called while watching " ); |
---|
[2ff2076] | 656 | |
---|
[dc0ba9c] | 657 | /* TODO: catch broken pipe */ |
---|
[dce3903] | 658 | ASSERTSOCKOP( ret = send( tf->fd, buffer, len, 0 ), "Sending" ); |
---|
| 659 | |
---|
[dc0ba9c] | 660 | if( tf->byteswritten == 0 ) |
---|
| 661 | tf->ft->started = time( NULL ); |
---|
| 662 | |
---|
[dce3903] | 663 | tf->byteswritten += ret; |
---|
[2ff2076] | 664 | |
---|
[dce3903] | 665 | /* TODO: this should really not be fatal */ |
---|
| 666 | if( ret < len ) |
---|
| 667 | return jabber_bs_abort( bt, "send() sent %d instead of %d (send buffer too big!)", ret, len ); |
---|
| 668 | |
---|
| 669 | bt->tf->watch_out = b_input_add( tf->fd, GAIM_INPUT_WRITE, jabber_bs_send_can_write, bt ); |
---|
[2ff2076] | 670 | |
---|
| 671 | return TRUE; |
---|
| 672 | } |
---|
| 673 | |
---|
[dce3903] | 674 | /* |
---|
| 675 | * Handles the reply by the receiver containing the used streamhost. |
---|
| 676 | */ |
---|
[2ff2076] | 677 | static xt_status jabber_bs_send_handle_reply(struct im_connection *ic, struct xt_node *node, struct xt_node *orig ) { |
---|
| 678 | struct jabber_transfer *tf = NULL; |
---|
| 679 | struct jabber_data *jd = ic->proto_data; |
---|
| 680 | struct bs_transfer *bt; |
---|
| 681 | GSList *tflist; |
---|
| 682 | struct xt_node *c; |
---|
| 683 | char *sid, *jid; |
---|
| 684 | |
---|
| 685 | if( !( c = xt_find_node( node->children, "query" ) ) || |
---|
| 686 | !( c = xt_find_node( c->children, "streamhost-used" ) ) || |
---|
| 687 | !( jid = xt_find_attr( c, "jid" ) ) ) |
---|
| 688 | |
---|
| 689 | { |
---|
| 690 | imcb_log( ic, "WARNING: Received incomplete bytestream reply" ); |
---|
| 691 | return XT_HANDLED; |
---|
| 692 | } |
---|
| 693 | |
---|
| 694 | if( !( c = xt_find_node( orig->children, "query" ) ) || |
---|
| 695 | !( sid = xt_find_attr( c, "sid" ) ) ) |
---|
| 696 | { |
---|
| 697 | imcb_log( ic, "WARNING: Error parsing request corresponding to the incoming bytestream reply" ); |
---|
| 698 | return XT_HANDLED; |
---|
| 699 | } |
---|
| 700 | |
---|
| 701 | /* Let's see if we can find out what this bytestream should be for... */ |
---|
| 702 | |
---|
| 703 | for( tflist = jd->filetransfers ; tflist; tflist = g_slist_next(tflist) ) |
---|
| 704 | { |
---|
| 705 | struct jabber_transfer *tft = tflist->data; |
---|
| 706 | if( ( strcmp( tft->sid, sid ) == 0 ) ) |
---|
| 707 | { |
---|
| 708 | tf = tft; |
---|
| 709 | break; |
---|
| 710 | } |
---|
| 711 | } |
---|
| 712 | |
---|
| 713 | if( !tf ) |
---|
| 714 | { |
---|
| 715 | imcb_log( ic, "WARNING: Received SOCKS5 bytestream reply to unknown request" ); |
---|
| 716 | return XT_HANDLED; |
---|
| 717 | } |
---|
| 718 | |
---|
| 719 | bt = tf->streamhandle; |
---|
| 720 | |
---|
| 721 | tf->accepted = TRUE; |
---|
| 722 | |
---|
[dc0ba9c] | 723 | if( strcmp( jid, tf->ini_jid ) == 0 ) |
---|
[2ff2076] | 724 | { |
---|
[dc0ba9c] | 725 | /* we're streamhost and target */ |
---|
| 726 | if( bt->phase == BS_PHASE_REPLY ) |
---|
| 727 | { |
---|
| 728 | /* handshake went through, let's start transferring */ |
---|
| 729 | tf->ft->write_request( tf->ft ); |
---|
| 730 | } |
---|
| 731 | } else |
---|
| 732 | { |
---|
[2625d6d] | 733 | /* using a proxy, abort listen */ |
---|
| 734 | |
---|
| 735 | closesocket( tf->fd ); |
---|
| 736 | tf->fd = 0; |
---|
| 737 | |
---|
| 738 | if ( bt->connect_timeout ) |
---|
| 739 | { |
---|
| 740 | b_event_remove( bt->connect_timeout ); |
---|
| 741 | bt->connect_timeout = 0; |
---|
| 742 | } |
---|
| 743 | |
---|
[dc0ba9c] | 744 | GSList *shlist; |
---|
| 745 | for( shlist = jd->streamhosts ; shlist ; shlist = g_slist_next( shlist ) ) |
---|
| 746 | { |
---|
| 747 | jabber_streamhost_t *sh = shlist->data; |
---|
| 748 | if( strcmp( sh->jid, jid ) == 0 ) |
---|
| 749 | { |
---|
| 750 | bt->sh = sh; |
---|
| 751 | jabber_bs_recv_handshake( bt, 0, 0 ); |
---|
| 752 | return XT_HANDLED; |
---|
| 753 | } |
---|
| 754 | } |
---|
| 755 | |
---|
| 756 | imcb_log( ic, "WARNING: Received SOCKS5 bytestream reply with unknown streamhost %s", jid ); |
---|
[2ff2076] | 757 | } |
---|
| 758 | |
---|
| 759 | return XT_HANDLED; |
---|
| 760 | } |
---|
| 761 | |
---|
[dc0ba9c] | 762 | /* |
---|
| 763 | * Tell the proxy to activate the stream. Looks like this: |
---|
| 764 | * |
---|
| 765 | * <iq type=set> |
---|
| 766 | * <query xmlns=bs sid=sid> |
---|
| 767 | * <activate>tgt_jid</activate> |
---|
| 768 | * </query> |
---|
| 769 | * </iq> |
---|
| 770 | */ |
---|
| 771 | void jabber_bs_send_activate( struct bs_transfer *bt ) |
---|
| 772 | { |
---|
| 773 | struct xt_node *node; |
---|
| 774 | |
---|
| 775 | node = xt_new_node( "activate", bt->tf->tgt_jid, NULL ); |
---|
| 776 | node = xt_new_node( "query", NULL, node ); |
---|
| 777 | xt_add_attr( node, "xmlns", XMLNS_BYTESTREAMS ); |
---|
| 778 | xt_add_attr( node, "sid", bt->tf->sid ); |
---|
| 779 | node = jabber_make_packet( "iq", "set", bt->sh->jid, node ); |
---|
| 780 | |
---|
| 781 | jabber_cache_add( bt->tf->ic, node, jabber_bs_send_handle_activate ); |
---|
| 782 | |
---|
| 783 | jabber_write_packet( bt->tf->ic, node ); |
---|
| 784 | } |
---|
| 785 | |
---|
| 786 | /* |
---|
| 787 | * The proxy has activated the bytestream. |
---|
| 788 | * We can finally start pushing some data out. |
---|
| 789 | */ |
---|
| 790 | static xt_status jabber_bs_send_handle_activate( struct im_connection *ic, struct xt_node *node, struct xt_node *orig ) |
---|
| 791 | { |
---|
| 792 | char *sid; |
---|
| 793 | GSList *tflist; |
---|
| 794 | struct jabber_transfer *tf; |
---|
| 795 | struct xt_node *query; |
---|
| 796 | struct jabber_data *jd = ic->proto_data; |
---|
| 797 | |
---|
| 798 | query = xt_find_node( orig->children, "query" ); |
---|
| 799 | sid = xt_find_attr( query, "sid" ); |
---|
| 800 | |
---|
| 801 | for( tflist = jd->filetransfers ; tflist; tflist = g_slist_next(tflist) ) |
---|
| 802 | { |
---|
| 803 | struct jabber_transfer *tft = tflist->data; |
---|
| 804 | if( ( strcmp( tft->sid, sid ) == 0 ) ) |
---|
| 805 | { |
---|
| 806 | tf = tft; |
---|
| 807 | break; |
---|
| 808 | } |
---|
| 809 | } |
---|
| 810 | |
---|
| 811 | if( !tf ) |
---|
| 812 | { |
---|
| 813 | imcb_log( ic, "WARNING: Received SOCKS5 bytestream activation for unknown stream" ); |
---|
| 814 | return XT_HANDLED; |
---|
| 815 | } |
---|
| 816 | |
---|
| 817 | /* handshake went through, let's start transferring */ |
---|
| 818 | tf->ft->write_request( tf->ft ); |
---|
| 819 | |
---|
| 820 | return XT_HANDLED; |
---|
| 821 | } |
---|
| 822 | |
---|
| 823 | /* |
---|
| 824 | * Starts a bytestream. |
---|
| 825 | */ |
---|
[2ff2076] | 826 | gboolean jabber_bs_send_start( struct jabber_transfer *tf ) |
---|
| 827 | { |
---|
[dc0ba9c] | 828 | char host[INET6_ADDRSTRLEN]; |
---|
[2ff2076] | 829 | struct bs_transfer *bt; |
---|
| 830 | sha1_state_t sha; |
---|
| 831 | char hash_hex[41]; |
---|
| 832 | unsigned char hash[20]; |
---|
[dc0ba9c] | 833 | int i,ret; |
---|
| 834 | struct jabber_data *jd = tf->ic->proto_data; |
---|
| 835 | jabber_streamhost_t sh; |
---|
| 836 | GSList *streamhosts = jd->streamhosts; |
---|
[2ff2076] | 837 | |
---|
| 838 | /* SHA1( SID + Initiator JID + Target JID ) is given to the streamhost which it will match against the initiator's value */ |
---|
| 839 | sha1_init( &sha ); |
---|
| 840 | sha1_append( &sha, (unsigned char*) tf->sid, strlen( tf->sid ) ); |
---|
| 841 | sha1_append( &sha, (unsigned char*) tf->ini_jid, strlen( tf->ini_jid ) ); |
---|
| 842 | sha1_append( &sha, (unsigned char*) tf->tgt_jid, strlen( tf->tgt_jid ) ); |
---|
| 843 | sha1_finish( &sha, hash ); |
---|
| 844 | |
---|
| 845 | for( i = 0; i < 20; i ++ ) |
---|
| 846 | sprintf( hash_hex + i * 2, "%02x", hash[i] ); |
---|
| 847 | |
---|
| 848 | bt = g_new0( struct bs_transfer, 1 ); |
---|
| 849 | bt->tf = tf; |
---|
| 850 | bt->phase = BS_PHASE_CONNECT; |
---|
| 851 | bt->pseudoadr = g_strdup( hash_hex ); |
---|
| 852 | tf->streamhandle = bt; |
---|
| 853 | tf->ft->free = jabber_bs_free_transfer; |
---|
| 854 | tf->ft->canceled = jabber_bs_canceled; |
---|
| 855 | |
---|
[dc0ba9c] | 856 | if ( !jabber_bs_send_listen( bt, &tf->saddr, sh.host = host, sh.port ) ) |
---|
[2ff2076] | 857 | return FALSE; |
---|
| 858 | |
---|
| 859 | bt->tf->watch_in = b_input_add( tf->fd, GAIM_INPUT_READ, jabber_bs_send_handshake, bt ); |
---|
| 860 | bt->connect_timeout = b_timeout_add( JABBER_BS_LISTEN_TIMEOUT * 1000, jabber_bs_connect_timeout, bt ); |
---|
[dc0ba9c] | 861 | |
---|
| 862 | sh.jid = tf->ini_jid; |
---|
| 863 | |
---|
| 864 | /* temporarily add listen address to streamhosts, send the request and remove it */ |
---|
| 865 | streamhosts = g_slist_prepend( streamhosts, &sh ); |
---|
| 866 | ret = jabber_bs_send_request( tf, streamhosts); |
---|
| 867 | streamhosts = g_slist_remove( streamhosts, &sh ); |
---|
| 868 | |
---|
| 869 | return ret; |
---|
[2ff2076] | 870 | } |
---|
| 871 | |
---|
[dc0ba9c] | 872 | gboolean jabber_bs_send_request( struct jabber_transfer *tf, GSList *streamhosts ) |
---|
[2ff2076] | 873 | { |
---|
[dc0ba9c] | 874 | struct xt_node *shnode, *query, *iq; |
---|
[2ff2076] | 875 | |
---|
| 876 | query = xt_new_node( "query", NULL, NULL ); |
---|
| 877 | xt_add_attr( query, "xmlns", XMLNS_BYTESTREAMS ); |
---|
| 878 | xt_add_attr( query, "sid", tf->sid ); |
---|
| 879 | xt_add_attr( query, "mode", "tcp" ); |
---|
[dc0ba9c] | 880 | |
---|
| 881 | while( streamhosts ) { |
---|
| 882 | jabber_streamhost_t *sh = streamhosts->data; |
---|
| 883 | shnode = xt_new_node( "streamhost", NULL, NULL ); |
---|
| 884 | xt_add_attr( shnode, "jid", sh->jid ); |
---|
| 885 | xt_add_attr( shnode, "host", sh->host ); |
---|
| 886 | xt_add_attr( shnode, "port", sh->port ); |
---|
| 887 | |
---|
| 888 | xt_add_child( query, shnode ); |
---|
| 889 | |
---|
| 890 | streamhosts = g_slist_next( streamhosts ); |
---|
| 891 | } |
---|
| 892 | |
---|
[2ff2076] | 893 | |
---|
| 894 | iq = jabber_make_packet( "iq", "set", tf->tgt_jid, query ); |
---|
| 895 | xt_add_attr( iq, "from", tf->ini_jid ); |
---|
| 896 | |
---|
| 897 | jabber_cache_add( tf->ic, iq, jabber_bs_send_handle_reply ); |
---|
| 898 | |
---|
| 899 | if( !jabber_write_packet( tf->ic, iq ) ) |
---|
| 900 | imcb_file_canceled( tf->ft, "Error transmitting bytestream request" ); |
---|
| 901 | return TRUE; |
---|
| 902 | } |
---|
| 903 | |
---|
| 904 | gboolean jabber_bs_send_handshake_abort(struct bs_transfer *bt, char *error ) |
---|
| 905 | { |
---|
| 906 | struct jabber_transfer *tf = bt->tf; |
---|
[2625d6d] | 907 | struct jabber_data *jd = tf->ic->proto_data; |
---|
[2ff2076] | 908 | |
---|
[dc0ba9c] | 909 | /* TODO: did the receiver get here somehow??? */ |
---|
[2ff2076] | 910 | imcb_log( tf->ic, "Transferring file %s: SOCKS5 handshake failed: %s", |
---|
| 911 | tf->ft->file_name, |
---|
| 912 | error ); |
---|
| 913 | |
---|
[2625d6d] | 914 | if( jd->streamhosts==NULL ) /* we're done here unless we have a proxy to try */ |
---|
| 915 | imcb_file_canceled( tf->ft, error ); |
---|
[2ff2076] | 916 | |
---|
| 917 | return FALSE; |
---|
| 918 | } |
---|
| 919 | |
---|
| 920 | /* |
---|
| 921 | * Creates a listening socket and returns it in saddr_ptr. |
---|
| 922 | */ |
---|
| 923 | gboolean jabber_bs_send_listen( struct bs_transfer *bt, struct sockaddr_storage *saddr, char *host, char *port ) |
---|
| 924 | { |
---|
| 925 | struct jabber_transfer *tf = bt->tf; |
---|
[6cac643] | 926 | int fd,gret; |
---|
[2ff2076] | 927 | char hostname[ HOST_NAME_MAX + 1 ]; |
---|
| 928 | struct addrinfo hints, *rp; |
---|
| 929 | socklen_t ssize = sizeof( struct sockaddr_storage ); |
---|
| 930 | |
---|
| 931 | /* won't be long till someone asks for this to be configurable :) */ |
---|
| 932 | |
---|
| 933 | ASSERTSOCKOP( gethostname( hostname, sizeof( hostname ) ), "gethostname()" ); |
---|
| 934 | |
---|
| 935 | memset( &hints, 0, sizeof( struct addrinfo ) ); |
---|
| 936 | hints.ai_socktype = SOCK_STREAM; |
---|
| 937 | hints.ai_flags = AI_NUMERICSERV; |
---|
| 938 | |
---|
[6cac643] | 939 | if ( ( gret = getaddrinfo( hostname, "0", &hints, &rp ) ) != 0 ) |
---|
| 940 | return jabber_bs_abort( bt, "getaddrinfo() failed: %s", gai_strerror( gret ) ); |
---|
[2ff2076] | 941 | |
---|
| 942 | memcpy( saddr, rp->ai_addr, rp->ai_addrlen ); |
---|
| 943 | |
---|
| 944 | ASSERTSOCKOP( fd = tf->fd = socket( saddr->ss_family, SOCK_STREAM, 0 ), "Opening socket" ); |
---|
| 945 | |
---|
| 946 | ASSERTSOCKOP( bind( fd, ( struct sockaddr *)saddr, rp->ai_addrlen ), "Binding socket" ); |
---|
| 947 | |
---|
| 948 | freeaddrinfo( rp ); |
---|
| 949 | |
---|
| 950 | ASSERTSOCKOP( listen( fd, 1 ), "Making socket listen" ); |
---|
| 951 | |
---|
| 952 | if ( !inet_ntop( saddr->ss_family, saddr->ss_family == AF_INET ? |
---|
| 953 | ( void * )&( ( struct sockaddr_in * ) saddr )->sin_addr.s_addr : ( void * )&( ( struct sockaddr_in6 * ) saddr )->sin6_addr.s6_addr |
---|
| 954 | , host, INET6_ADDRSTRLEN ) ) |
---|
| 955 | return jabber_bs_abort( bt, "inet_ntop failed on listening socket" ); |
---|
| 956 | |
---|
| 957 | ASSERTSOCKOP( getsockname( fd, ( struct sockaddr *)saddr, &ssize ), "Getting socket name" ); |
---|
| 958 | |
---|
| 959 | if( saddr->ss_family == AF_INET ) |
---|
| 960 | sprintf( port, "%d", ntohs( ( ( struct sockaddr_in *) saddr )->sin_port ) ); |
---|
| 961 | else |
---|
| 962 | sprintf( port, "%d", ntohs( ( ( struct sockaddr_in6 *) saddr )->sin6_port ) ); |
---|
| 963 | |
---|
| 964 | return TRUE; |
---|
| 965 | } |
---|
| 966 | |
---|
| 967 | /* |
---|
| 968 | * SOCKS5BYTESTREAM protocol for the sender |
---|
| 969 | */ |
---|
| 970 | gboolean jabber_bs_send_handshake( gpointer data, gint fd, b_input_condition cond ) |
---|
| 971 | { |
---|
| 972 | struct bs_transfer *bt = data; |
---|
| 973 | struct jabber_transfer *tf = bt->tf; |
---|
| 974 | short revents; |
---|
| 975 | |
---|
| 976 | if ( !jabber_bs_poll( bt, fd, &revents ) ) |
---|
| 977 | return FALSE; |
---|
| 978 | |
---|
| 979 | switch( bt->phase ) |
---|
| 980 | { |
---|
| 981 | case BS_PHASE_CONNECT: |
---|
| 982 | { |
---|
| 983 | struct sockaddr_storage clt_addr; |
---|
| 984 | socklen_t ssize = sizeof( clt_addr ); |
---|
| 985 | |
---|
| 986 | /* Connect */ |
---|
| 987 | |
---|
| 988 | ASSERTSOCKOP( tf->fd = accept( fd, (struct sockaddr *) &clt_addr, &ssize ), "Accepting connection" ); |
---|
| 989 | |
---|
| 990 | closesocket( fd ); |
---|
| 991 | fd = tf->fd; |
---|
| 992 | sock_make_nonblocking( fd ); |
---|
| 993 | |
---|
| 994 | bt->phase = BS_PHASE_CONNECTED; |
---|
| 995 | |
---|
| 996 | bt->tf->watch_in = b_input_add( fd, GAIM_INPUT_READ, jabber_bs_send_handshake, bt ); |
---|
| 997 | return FALSE; |
---|
| 998 | } |
---|
| 999 | case BS_PHASE_CONNECTED: |
---|
| 1000 | { |
---|
| 1001 | int ret, have_noauth=FALSE; |
---|
| 1002 | struct { |
---|
| 1003 | unsigned char ver; |
---|
| 1004 | unsigned char method; |
---|
| 1005 | } socks5_auth_reply = { .ver = 5, .method = 0 }; |
---|
| 1006 | struct { |
---|
| 1007 | unsigned char ver; |
---|
| 1008 | unsigned char nmethods; |
---|
| 1009 | unsigned char method; |
---|
| 1010 | } socks5_hello; |
---|
| 1011 | |
---|
| 1012 | if( !( ret = jabber_bs_peek( bt, &socks5_hello, sizeof( socks5_hello ) ) ) ) |
---|
| 1013 | return FALSE; |
---|
| 1014 | |
---|
| 1015 | if( ret < sizeof( socks5_hello ) ) |
---|
| 1016 | return TRUE; |
---|
| 1017 | |
---|
| 1018 | if( !( socks5_hello.ver == 5 ) || |
---|
| 1019 | !( socks5_hello.nmethods >= 1 ) || |
---|
| 1020 | !( socks5_hello.nmethods < 32 ) ) |
---|
| 1021 | return jabber_bs_abort( bt, "Invalid auth request ver=%d nmethods=%d method=%d", socks5_hello.ver, socks5_hello.nmethods, socks5_hello.method ); |
---|
| 1022 | |
---|
| 1023 | have_noauth = socks5_hello.method == 0; |
---|
| 1024 | |
---|
| 1025 | if( socks5_hello.nmethods > 1 ) |
---|
| 1026 | { |
---|
| 1027 | char mbuf[32]; |
---|
| 1028 | int i; |
---|
| 1029 | ASSERTSOCKOP( ret = recv( fd, mbuf, socks5_hello.nmethods - 1, 0 ) , "Receiving auth methods" ); |
---|
| 1030 | if( ret < ( socks5_hello.nmethods - 1 ) ) |
---|
| 1031 | return jabber_bs_abort( bt, "Partial auth request"); |
---|
| 1032 | for( i = 0 ; !have_noauth && ( i < socks5_hello.nmethods - 1 ) ; i ++ ) |
---|
| 1033 | if( mbuf[i] == 0 ) |
---|
| 1034 | have_noauth = TRUE; |
---|
| 1035 | } |
---|
| 1036 | |
---|
| 1037 | if( !have_noauth ) |
---|
| 1038 | return jabber_bs_abort( bt, "Auth request didn't include no authentication" ); |
---|
| 1039 | |
---|
| 1040 | ASSERTSOCKOP( send( fd, &socks5_auth_reply, sizeof( socks5_auth_reply ) , 0 ), "Sending auth reply" ); |
---|
| 1041 | |
---|
| 1042 | bt->phase = BS_PHASE_REQUEST; |
---|
| 1043 | |
---|
| 1044 | return TRUE; |
---|
| 1045 | } |
---|
| 1046 | case BS_PHASE_REQUEST: |
---|
| 1047 | { |
---|
| 1048 | struct socks5_message socks5_connect; |
---|
| 1049 | int msgsize = sizeof( struct socks5_message ); |
---|
| 1050 | |
---|
| 1051 | if( !jabber_bs_peek( bt, &socks5_connect, msgsize ) ) |
---|
| 1052 | return FALSE; |
---|
| 1053 | |
---|
| 1054 | if( !( socks5_connect.ver == 5) || |
---|
| 1055 | !( socks5_connect.cmdrep.cmd == 1 ) || |
---|
| 1056 | !( socks5_connect.atyp == 3 ) || |
---|
| 1057 | !(socks5_connect.addrlen == 40 ) ) |
---|
| 1058 | return jabber_bs_abort( bt, "Invalid SOCKS5 Connect message (addrlen=%d, ver=%d, cmd=%d, atyp=%d)", socks5_connect.addrlen, socks5_connect.ver, socks5_connect.cmdrep.cmd, socks5_connect.atyp ); |
---|
| 1059 | if( !( memcmp( socks5_connect.address, bt->pseudoadr, 40 ) == 0 ) ) |
---|
| 1060 | return jabber_bs_abort( bt, "SOCKS5 Connect message contained wrong digest"); |
---|
| 1061 | |
---|
| 1062 | socks5_connect.cmdrep.rep = 0; |
---|
| 1063 | |
---|
| 1064 | ASSERTSOCKOP( send( fd, &socks5_connect, msgsize, 0 ), "Sending connect reply" ); |
---|
| 1065 | |
---|
| 1066 | bt->phase = BS_PHASE_REPLY; |
---|
| 1067 | |
---|
[dce3903] | 1068 | imcb_log( tf->ic, "File %s: SOCKS5 handshake successful! Transfer about to start...", tf->ft->file_name ); |
---|
| 1069 | |
---|
[2ff2076] | 1070 | if( tf->accepted ) |
---|
| 1071 | { |
---|
[dce3903] | 1072 | /* streamhost-used message came already in(possible?), let's start sending */ |
---|
| 1073 | tf->ft->write_request( tf->ft ); |
---|
[2ff2076] | 1074 | } |
---|
| 1075 | |
---|
| 1076 | tf->watch_in = 0; |
---|
| 1077 | return FALSE; |
---|
| 1078 | |
---|
| 1079 | } |
---|
| 1080 | default: |
---|
| 1081 | /* BUG */ |
---|
| 1082 | imcb_log( bt->tf->ic, "BUG in file transfer code: undefined handshake phase" ); |
---|
| 1083 | |
---|
| 1084 | bt->tf->watch_in = 0; |
---|
| 1085 | return FALSE; |
---|
| 1086 | } |
---|
| 1087 | } |
---|
| 1088 | #undef ASSERTSOCKOP |
---|